CHM 103 Lab Final Qu estions and
answ er s w ith accu r ate
r ationales(PASSED)
If you want to determine the density of some metal shot, and you only use only a
few small individual pieces of metal shot, how would this impact the precision of
your measurements? How would this affect the accuracy of the density? - answer
When the metal is added to the water, the difference in volume will be very small.
Since the size of the graduated cylinder limits precision, the density won't be
accurately calculated.
The measured density of a sample of unknown metal shot is 8.93 g/mL. Assuming
that the values in the table of published densities (Table 1.1), has an uncertainty
of ±0.03 g/mL, explain why it is not possible to determine which type of metal
shot it is. - answer Based on the uncertainty, the identity of the metal shot could
be two different metals, so more significant figures would be needed to assign the
type.
The sides of a certain rectangular wood block are 0.1294 meters, 7.41 centimeters
and 9.4 millimeters. The mass of the block is 55.917 grams. Determine the density
of this wood and record in the correct number of significant digits. - answer d =
0.62 g/cm3
Twelve irregular solid "blobs" of a certain metal weigh 71.657 grams when
weighed on an analytical balance. The liquid level in a graduated cylinder initially
shows 19.5 milliliters; after placing the twelve pieces into the cylinder the liquid
level rises to 25.9 milliliters. Determine the density of the metal and use the
density table to identify the metal. - answer Lead
answ er s w ith accu r ate
r ationales(PASSED)
If you want to determine the density of some metal shot, and you only use only a
few small individual pieces of metal shot, how would this impact the precision of
your measurements? How would this affect the accuracy of the density? - answer
When the metal is added to the water, the difference in volume will be very small.
Since the size of the graduated cylinder limits precision, the density won't be
accurately calculated.
The measured density of a sample of unknown metal shot is 8.93 g/mL. Assuming
that the values in the table of published densities (Table 1.1), has an uncertainty
of ±0.03 g/mL, explain why it is not possible to determine which type of metal
shot it is. - answer Based on the uncertainty, the identity of the metal shot could
be two different metals, so more significant figures would be needed to assign the
type.
The sides of a certain rectangular wood block are 0.1294 meters, 7.41 centimeters
and 9.4 millimeters. The mass of the block is 55.917 grams. Determine the density
of this wood and record in the correct number of significant digits. - answer d =
0.62 g/cm3
Twelve irregular solid "blobs" of a certain metal weigh 71.657 grams when
weighed on an analytical balance. The liquid level in a graduated cylinder initially
shows 19.5 milliliters; after placing the twelve pieces into the cylinder the liquid
level rises to 25.9 milliliters. Determine the density of the metal and use the
density table to identify the metal. - answer Lead
